// Copyright 2017 PingCAP, Inc.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//     http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// See the License for the specific language governing permissions and
// limitations under the License.

package util

import (
	"sync"
	"time"
)

// ProcessInfo is a struct used for show processlist statement.
type ProcessInfo struct {
	ID      uint64
	User    string
	Host    string
	DB      string
	Command string
	Time    time.Time
	State   uint16
	Info    string
	Mem     int64

	// 操作目标信息
	DestUser string
	DestHost string
	DestPort int
	// 当前操作状态
	OperState string
	// 操作进度. 审核/执行/备份时自动计算
	Percent float64
}

// SessionManager is an interface for session manage. Show processlist and
// kill statement rely on this interface.
type SessionManager interface {
	// ShowProcessList returns map[connectionID]ProcessInfo
	ShowProcessList() map[uint64]ProcessInfo
	Kill(connectionID uint64, query bool)

	// 添加osc进程
	AddOscProcess(p *OscProcessInfo)
	// 返回osc进程列表
	ShowOscProcessList() map[string]*OscProcessInfo
	ShowOscProcessListWithWrite() map[string]*OscProcessInfo
	OscLock()
	OscUnLock()
	// Kill当前会话的Osc进程
	KillOscProcess(connectionID uint64)
}

// ProcessOperation Process operation
type ProcessOperation int

// Process operation.
const (
	ProcessOperationNone ProcessOperation = iota
	ProcessOperationKill
	ProcessOperationPause
	ProcessOperationResume
)

// OscProcessInfo is a struct used for show osc processlist statement.
type OscProcessInfo struct {
	ID uint64
	// 连接ID
	ConnID uint64

	Schema     string
	Table      string
	Command    string
	Sqlsha1    string
	Percent    int
	RemainTime string
	Info       string

	Killed bool

	IsGhost bool
	Pause   bool

	PanicAbort chan ProcessOperation

	// gh-ost serve-socket-file
	SocketFile string

	RW *sync.RWMutex
}
